Extrusion & Post
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LDPE Film Wrinkles
Problem Phenomenon
Longitudinal and transverse wrinkles appear on the wound film surface, and some wrinkles cannot be smoothed out.
Cause Analysis
Uneven die head installation, off-center collapsing frame and haul-off rolls, and non-level nip rolls are mechanical causes; film bubble deformation, improper cooling and inconstant tension are process causes.
Solution
①Correct die head levelness and alignment of all parts; ②adjust the collapsing frame opening angle to match the bubble tube diameter; ③stabilize the film bubble and cooling; ④adjust winding tension to be constant.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Wrinkle troubleshooting goes mechanical first and process second; alignment correction can solve most stubborn wrinkles.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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